Patent attributes
Investment casting of an engine part using a pair of core members having respective opposed faces spaced apart by a first distance, a face of a first core member of the pair being provided with one or more protrusions thereon and a face of the second core member of the pair being provided with one or more respective open recesses therein, each protrusion facing a respective open recess, wherein during a casting procedure the first and second core members are maintained positioned relative to each other so major portions of the opposed faces of the first and second core members assume mutual spacing equaling a corresponding predetermined thickness of a portion of a resulting cast wall of the first distance; and at least a head portion of the protrusion is located within the respective open recess to define a minor portion of the resulting cast wall.
